Final answer:
The top priority in caring for a child with Wilms' tumor is to avoid abdominal palpation during physical examinations to prevent the risk of tumor rupture or spread.
Step-by-step explanation:
The priority nursing responsibility in the care of a child with Wilms' tumor is to omit abdominal palpation during daily assessments. Wilms' tumor, also known as nephroblastoma, is a type of kidney cancer that primarily affects children. The tumor can rupture or spread if the abdomen is palpated, which is why it is critical to avoid this during physical examinations. While maintaining accurate intake and output records can be important, it is not specific to the care of Wilms' tumor. Strict bed rest is not a general requirement for these patients unless medically indicated for other reasons. Assessing neurological function, although essential in certain clinical scenarios, such as the presence of symptoms indicative of central nervous system involvement, is not the primary concern when managing Wilms' tumor.